def sgChecksum(uin):
    uin = uin.upper()
    if not re.match('^[FGST]\d{7}[A-Z]$', uin):
	return False

    weight = [2, 7, 6, 5, 4, 3, 2]
    st = ['J', 'Z', 'I', 'H', 'G', 'F', 'E', 'D', 'C', 'B', 'A']
    fg = ['X', 'W', 'U', 'T', 'R', 'Q', 'P', 'N', 'M', 'L', 'K']

    sum = 0
    for i in xrange(7):
	sum += weight[i] * int(uin[i+1])

    if uin[0]=='F':
	sum %= 11
	if not uin[8]==fg[sum]:
	    return False
    elif uin[0]=='G':
	sum = (sum + 4) % 11
	if not uin[8]==fg[sum]:
	    return False
    elif uin[0]=='S':
	sum %= 11
	if not uin[8]==st[sum]:
	    return False
    elif uin[0]=='T':
	sum = (sum + 4) % 11
	if not uin[8]==st[sum]:
	    return False

    return True

python

1

Singapore NIRC checksum.

def sgChecksum(uin):
    uin = uin.upper()
    if not re.match('^[FGST]\d{7}[A-Z]$', uin):
	return False

    weight = [2, 7, 6, 5, 4, 3, 2]
    st = ['J', 'Z', 'I', 'H', 'G', 'F', 'E', 'D', 'C', 'B', 'A']
    fg = ['X', 'W', 'U', 'T', 'R', 'Q', 'P', 'N', 'M', 'L', 'K']

    sum = 0
    for i in xrange(7):
	sum += weight[i] * int(uin[i+1])

    if uin[0]=='F':
	sum %= 11
	if not uin[8]==fg[sum]:
	    return False
    elif uin[0]=='G':
	sum = (sum + 4) % 11
	if not uin[8]==fg[sum]:
	    return False
    elif uin[0]=='S':
	sum %= 11
	if not uin[8]==st[sum]:
	    return False
    elif uin[0]=='T':
	sum = (sum + 4) % 11
	if not uin[8]==st[sum]:
	    return False

    return True

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• checksum, 
• nirc, 
• python, 
• singapore